Smith Precision Products Company offers a full line of positive displacement pumps for liquefied gas transfer. Designed for safety and high performance Smith pumps are unequalled in installations ranging from small capacity cylinder filling to large capacity bulk loading or unloading facilities. Smith Precision Products Company has been designing and manufacturing liquefied gas pumps since 1938 and has introduced many innovative designs now standard on most liquefied gas pumps. Positive Displacement Gear Design lends to highest efficiency.   Smith pumps utilize a high efficiency gear set designed for high performance, minimal slippage, and ease of maintenance. The unique design allows for balanced internal loading which greatly increases pump life expectancy. Smith pumps are widely used for applications including cylinder filling, automotive fueling, bulk transfer, vaporizers, high pressure burners and truck applications.   Standard base type models are available in 3/4, 1, 1-1/2, 2-1/2, and 4-inch port sizes. Options include threaded housing ports or threaded and/or weld flanges. Smith pumps utilize a 3-piece mechanical shaft seal designed as an integral part of the pump shaft. This unique feature allows the actual seal ring to rotate at 1/2 the shaft speed, greatly increasing seal life. Also, should mechanical seal replacement ever be necessary in the field, service personnel won't be fumbling around with loose seal components. The Smith mechanical seal is received as a factory tested, assembled unit that cannot be taken apart. Another feature of all Smith pumps include an ease of maintenance design that allows the gear set to be replaced WITHOUT taking the mechanical shaft seal apart.   ALL PUMPS AND BYPASS RELIEF VALVES shown on this website are listed with the Underwriters Laboratories and are manufactured and tested to U.L.-51. State-of-the-art mechanical shaft assembly Easily replaceable gear set without disturbing mechanical shaft seal or piping Simple removal: no loose parts